Description

The bug

The beacon's model's glass doesn't cull against other beacons, however, unlike the glass block. Considering a glass block does cull itself, I am in the personal belief a beacon's glass should cull itself too. (Glass blocks and beacon glass should also cull each other if it should look completely right, but I'll take it as fixed as long as the beacon just culls itself.)

How to reproduce

Place a beacon right beside another beacon
→ Notice the glass between the beacons being visible

Note

Modifying the JSON block model of the beacon to have the glass cull will only cull the glass against solid opaque blocks (which in my opinion it also should cull against), not other beacons.